Liquid-ejecting nozzle



Nov. 26, 1968 P. BOUCHER ET AL 3,412,936

LIQUID-EJECTING NOZZLE Filed Aug. 15, 1966 FIG. 4.

FIGS

United States Patent Office 3,412,936 LIQUID-EJECTING NOZZLE Percival Lionel Boucher and Denis Angelinetta, Loudon, England, assignors to Glenield & Kennedy Limited, Kilmarnock, Scotland, a British company Filed Aug. 15, 1966, Ser. No. 572,341 Claims priority, application Great Britain, Aug. 28, 1965 37,076/ 65 4 Claims. (Cl. 239-107) ABSTRACT OF THE DISCLOSURE A liquid-ejecting nozzle consisting of a tubular casing having ia side wall in which a port is formed. The casing presents an annular valve seat located part of the way across the port and a yplunger is movable within the casing. A spring urges the plunger to move across the port into engagement with ythe valve seat and the end of the casing adjacent the rear end of the valve seat is connectible to a source of supply of water.

The subject of -this invention is a liquid-ejecting nozzle particularly for use in. cleaning rotary drum lters where it is desirable to provide cleaning jets consisting of flat fantailed splayed sheets of water to be directed against the filter.

A nozzle according to the invention consists of a tubular casing formed with a port `in its side wall, and containing an annular valve seat located part of the way across the port, a plunger movable within the casing, and a spring urging the plunger to move across the port into engagement with the valve seat, the end of the casing adjacent the rear end of the valve seat being connectible to a source of supply of water.

A portion of the end of the plunger facing the valve seat may be cutaway so that a permanent gap is presented between the valve seat and a portion of the adjacent end of the plunger.

The end of the plunger may be formed with a segmental projection arranged to, enter the `annular valve seat, the chordal surface of the segmental projection being positioned to lie adjacent the port in the casing.

The gap between the portion of the adjacent end of the plunger and the valve seat may be formed by extend- -ing the chordal surface 4of the segmental projection into the body of the plunger for a distance equal to the width of the gap required.

The annular valve seat may be constituted by one end of a tubular liner xed within the casing.

In one constructionvthe plunger is attached to a rod projecting from the en dnof the casing opposite thiat connectible to the water s iipply, the rod passing through a hole in an end plug screw-threaded into the end of the casing to form an adjustable abutment for the spring, the outer end of the plug projecting beyond the end 'of the casing and being provided with an open-ended slot arranged to receive a crloss pin passing through the projecting end of the rod. 'Engagement of the cross pin in the slot maintains the chordal surface of the segmental projection in the correct relationship with the slot in the casing.

Alternatively, the end of the rod :projecting from the plug may be screw-threaded to receive a nut which abuts the end of the plug to provide an adjustable abutment for the spring.

A practical embodiment of the invention is illustrated in the accompanying drawings in which FIG. 1 is an ex terior view of a nozzle, FIG. 2 is la longitudinal section of the nozzle to a larger scale, FIG. 3 is a section on the line 3,412,936 Patented Nov. 26, 1968 3--3 in FIG. 2 and FIG. 4 is a view showing the plunger removed from the nozzle.

' In the drawings, 1 denotes a tubular casing formed with a port 2 in its side wall, the end 3 of the casing 1 being connectible to a source of supply of water. 4 denotes a plunger movable within the casing 1, the plunger 4 being formed with "a segmental projection 5 having a chordal surface 6 which extends for a distance 6A into the body of the plunger 4, the body of the plunger being cut back to present an end face 6B. 7 denotes a packing ring resting in a groove in the plunger 4 to prevent leakrage past the plunger. The plunger 4 is connected to a rod 8 which projects from the end of the casing 1 through an end plug 9 screw-threaded into the casing 1 and formed with a transverse notch 10, a cross pin 11 passing through a hole 12 in the rod 8 being engageable with the notch 10, the angular position of the plunger 4 in the casing 1 being thus determined vso that the chordal surface 6 is held adjacent the port 2. 12 denotes a tubular linertixed within the casing 1 and 13 denotes a spring urging the plunger 4 to move into engagement with the valve seat constituted by the adjacent end of the liner 12, the segmental projection 5 of the :plunger 4 entering the adjacent end of `the liner 12.

In practice, water entering the end 3 of the nozzle ows through lthe interior of the liner 12 and enters the space between the chordal surface 6 of the plungery 4 and the ladjacent portion of the wall of the liner 12.fr:fThe water then issues as :a flat sheet through the gap between the end of 4the liner 12 and the face 6B of the plunger 4 and is projected through the port 2. The thickness of the sheet is equal to the distance `6A when the plunger 4 abuts against the liner 12. The thickness of the jet imay be increased by rotating the end plug 9 so that the plug 9` is screwed to some extent out of the casing 1,'care being taken to see that the plug is left in the proper position to -hold the plunger 4 with the chordal surface 6 adjacent the port 2. If for any reason the pressure of water entering the casing should become excessive the pressure ofthe water acting against the end of the plunger 4 causes the plunger 4 to move in opposition to the spring 13 to compress the spring and widen the gap presented between the'y end of the l-iner 12 and the face 6B of thevfplunger 4 thus providing an increased -area for the ow of water. This automatic opening of the gap permits automatic ilushing of the nozzle to take place. It is normally necessary to flush such nozzles periodically to remove accumulations of debris which tend to build up at the, nozzle. Such a ilushing operation can be performed easily by using'. the cross pin 11 `as -a handle and pulling the plunger 4in opposition to the spring 13 to open the gap.

The spray :produced by the nozzle according to the invention is thin and dat and splayed and these are the characteristics it is most desirable to have in laliushing spray.

What is claimed is:

1. A liquid-ejecting nozzle consisting of a tubular casing :having a side wall in which a port is formed, the casing presenting an annular valve seat located part of the way `across the port, a plunger movable within the casing, the end of said plunger beingformed with ,a segmental projection arranged to enter the annular valve seat,a spring urging the plunger to move across the port -into engagement with the valve seat, the end of the casing adjacent the rear end of the valve seat being connectible to a source of supply of water, an end :plug screw-threaded intothe end of thevcasing opposite that connectible to the water supply and formed with an axial hole and a transverse notch in the outer end, a rod passing through the axial hole in the plug and connected to the plunger and a cross pin passing transversely through the rod, said pin being engageable with the notch in the plug which latter is so positioned that when the pin is engaged with the notch the chordal surface of the segmental projection of the plunger lies adjacent the port in the side wall of the casing.

2. A nozzle as claimed in claim 1 in which a portion of the end of the plunger facing the valve seat is cut away so that a permanent gap is presented between the valve seat and a portion of the adjacent end of the plunger.

3. A nozzle as claimed in claim 2 in which the chordal surface of the segmental projection is extended into the body of the plunger for a distance equal to the width of the gap required, the adjacent end portion of the plunger 'being cut away.

4. A nozzle as claimed in claim 1 in which one end of a ltubular liner xed within the casing constitutes the annular valve seat.

References Cited UNITED STATES PATENTS EVERETT W. KIRBY, Primary Examiner. 

